By measuring soil moisture within various layers (above 240cm deepth) in the cultivated slopeland with 0°～25°during one year , a monthly change in soil moisture from May to September was discussed considering rainfall information. The results indicated that soil moisture decreased as gradient increased. The highest soil moisture occurred at a place where is 30m far away from the ridge line. Soil moistur eincreased with increasing rainfall.The effect of a moderate rainfall intensity on soil moisture was significant.Soil moisture was increased by high residue mulch. The change of monthly mean soil moisture from May to September was nearly a sinecurve.